Effects of Myofunctional Therapy with an Oral Screen on Lip Length and Strength in Clll Division 1 Patients
Document Type : مقالههای پژوهشی
Authors
- Navid Kariminasab 1
- Parya Biglari 2
- Behnam Khosravanifard 3
- Anahita Khayampour 4
- Mehrnoosh Tavakoli 2
1 Assistant Professor, Department of Orthodontics, School of Dentistry, Gilan University of Medical Sciences, Gilan, Iran.
2 Postgraduate Student, Department of Periodontics, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran.
3 Assistant Professor, Department of Orthodontics, School of Dentistry, Azad University of Tehran, Tehran, Iran.
4 Assistant Professor, Department of Oral and Maxillofacial Surgery, School of Dentistry, Golestan University of Medical Sciences, Gorgan, Iran.
Abstract
Materials & Methods: Thirty-five patients with Cl II division 1 malocclusion were included in the present study but at the end of the study two subjects were excluded due to lack of compliance. The remaining 33 subjectswere assigned to 3 groups: group 1 (n = 12), cooperative patients; group 2 (n = 6), patients with poor cooperation; and group 3 (n = 15), the controls. All the three groups underwent treatment with functional appliances; lip training was carried out for 5.5 months, 3 times a day for 10 minutes each time in the treatment group. Before and after the treatment the lip strength was recorded with the use of a custom-made dynamometer and lip morphology was studied on lateral cephalograms. The parametric paired t-test was used to compare values within the groups and independent t-test was used to compare changes between the groups. Statistical significance was set at p value < 0.05.
Results: The lengths of the upper and lower lips increased significantly (p value = 0.00) and interlabial gap decreased significantly in group 1 (p value = 0.00). However, in the control group and group 2 only theinterlabial gap decreased significantly (p value = 0.00 and p value = 0.01). The thickness of the upper lip in region A' in group 1 was significantly (p value = 0.02) higher than that in the control group after treatment. The strength of the lips increased significantly in all the groups but it was greater in groups 1 and 2.
Conclusion: Under the limitations of the present study, it appears myofunctional therapy with an oralscreen improved the function and morphology of the lips when it was performed regularly.
Key words: Cl II division 1 malocclusion, Myofunctional therapy, Oral screen.
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